yes i'm using wifi. I disabled it but that didn't help
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| pl2303 serial port + usb hub https://www.8devices.com/community/viewtopic.php?f=1&t=355 |
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| Author: | tgraf [ 25 Jan 2013, 09:26 ] |
| Post subject: | pl2303 serial port + usb hub |
Hi, I developed a software that relies on a usb stick to communicate with a radio network. The USB stick essentially is a usb serial converter (pl2303), it is correctly detected and found in /dev/ttyUSB0. If I just plug the Usb stick into the devboard and then run my programm everything works fine. But when I use a usb hub between the stick and the board, then run my programm, the whole system is going very slow (ssh connection takes years to connect, a simple "ps" takes about 2 sec ...). I already tried another usb hub, same problem. USB-Stick -> devboard => runs fine USB-Stick -> USB hub -> devboard => everything slow So do you have any suggestions what could cause this problem or what i can do? Thanks in advance |
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| Author: | Saulius [ 25 Jan 2013, 14:00 ] |
| Post subject: | Re: pl2303 serial port + usb hub |
Try FTDI chip based USB to serial converter. PL* and some other "low end" converters have issues with drivers (also applies to PC's, MAC's, etc). |
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| Author: | tgraf [ 25 Jan 2013, 14:20 ] |
| Post subject: | Re: pl2303 serial port + usb hub |
hi thanks for your reply. I think I didn't express myself clearly enough, I can't modify the usb stick (I just bought it), so I can't change the pl2303 to a ftdi chip. The stick also works fine on windows and linux machines (both with and without hub). You got any other suggestions? |
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| Author: | Saulius [ 25 Jan 2013, 14:42 ] |
| Post subject: | Re: pl2303 serial port + usb hub |
You can debug usb driver, this could help answering some questions. Else, try different hardware configurations. |
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| Author: | DominikS [ 28 Jan 2013, 06:36 ] |
| Post subject: | Re: pl2303 serial port + usb hub |
Are you using wi-fi? Then try turning it off. |
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| Author: | tgraf [ 30 Jan 2013, 08:18 ] |
| Post subject: | Re: pl2303 serial port + usb hub |
yes i'm using wifi. I disabled it but that didn't help
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